Trust your gut? Definitely. Research shows that your gut and all its good-for-you microbes (bacteria, fungi, etc.) play an essential role in your overall health, from digestion and metabolism to your central nervous system and brain function. That’s why nourishing it with the highest quality probiotics is key to a healthier, more vibrant you.

A revved up immune response, including for your respiratory system

Your immune system and gut microbiome (your gut’s ecosystem of more than 100 trillion bacteria1) are the ultimate duo. In fact, our gut accounts for about 70% of our whole immune system. That’s why feeding it with the highest quality probiotics is paramount to protecting your immune system against possible infections and cutting down just how long you’ll be sick too. (In one scientific review, kids and adults who took a probiotic supplement had “significantly fewer numbers of days of illness” and were absent from school less than those who took a placebo2.)

We chose Bifidobacterium lactis Bl-04 specifically because the research is aplenty—from proof that those who take Bl-04 have a faster immune response thanks to higher Immunoglobulin G levels3 to evidence that Bl-04 can help significantly reduce the risk of upper respiratory tract infections by 27%. Need more numbers? While the median time for the placebo group to get sick was 2.5 months, the median for those who took Bl-04 wasn’t until the 3.2-month mark4.

And not all Bifidobacteria are created equally—when comparing Bifidobacterium lactis Bl-04 to Bifidobacterium lactis Bi-07, and a placebo, researchers found that the risk of getting an upper respiratory illness was lower in the Bl-04 group4.


1 Nagano T, Otoshi T, Hazama D, et al. Novel cancer therapy targeting microbiome. Onco Targets Ther. 2019;12:3619-3624. doi:10.2147/OTT.S207546
2 King S, Glanville J, Sanders ME, Fitzgerald A, Varley D. Effectiveness of probiotics on the duration of illness in healthy children and adults who develop common acute respiratory infectious conditions: a systematic review and meta-analysis. Br J Nutr. 2014;112(1):41-54. doi:10.1017/S0007114514000075
3 Paineau D, Carcano D, Leyer G, et al. Effects of seven potential probiotic strains on specific immune responses in healthy adults: a double-blind, randomized, controlled trial. FEMS Immunol Med Microbiol. 2008;53(1):107-13. doi:10.1111/j.1574-695X.2008.00413.x
4 West NP, Horn PL, Pyne DB, et al. Probiotic supplementation for respiratory and gastrointestinal illness symptoms in healthy physically active individuals. Clin Nutr. 2014;33(4):581-7. doi:10.1016/j.clnu.2013.10.002